docs: def discrepant_snps(self):
          """ SNPs with discrepant positions and / or genotypes discovered while loading SNPs.
  
          Returns
          -------
          pandas.DataFrame
          """
          df = self._discrepant_positions.append(self._discrepant_genotypes)
          if len(df) > 1:
              df = df.drop_duplicates()
          return df